#a {
    width: 400px;
    height: 380px;
    margin: 100px auto;
    text-align: center;
    background: rgba(30, 82, 207, 0.35);
    border-radius: 5px;
    padding-top: 30px;
    color: whitesmoke;
}

#user_name {
    margin-top: 20px;

}

#input-text {
    width: 200px;
    height: 32px;
    border-radius: 4px;
    margin-top: 10px;
    margin-left: 9px;
    border: 1px;
}

#pwd {
    margin-top: 20px;
}

#rand_code {
    margin: 10px;
}

#font_size {
    text-align: center;
    font-size: 25px;
}

#login_bt {
    background: #3685f5;
    width: 50px;
    height: 32px;
    border-radius: 4px;
    margin-top: 10px;
    border: 1px;
    margin-right: 30px;
}

#reset {
    background: #3685f5;
    width: 50px;
    height: 32px;
    border-radius: 4px;
    margin-top: 10px;
    border: 1px;
    margin-left: 30px;
}

#pagerandom {
    width: 90px;
    height: 30px;
    border-radius: 4px;
    border: 1px;
}

#img_error {
    color: red
}
#user_name{
    margin-bottom: 15px;
}
#username {
    width: 200px;
    height: 32px;
    border-radius: 4px;
    border: 1px;
}
#user_pwd{
    margin-top: 15px;
}
#pwd {
    width: 200px;
    height: 32px;
    border-radius: 4px;
    margin-top: 10px;
    margin-left: 9px;
    border: 1px;
}

#select {
    padding-top: 20px;
    font-size: 18px;
}
#permission{
    height: 25px;
}
#select_span{
    display: inline-block;
}
#select_select{
    display: inline-block;
    padding-right: 80px;
}